611861640 has 128 divisors (see below), whose sum is σ = 2062851840. Its totient is φ = 144055296.

The previous prime is 611861629. The next prime is 611861647. The reversal of 611861640 is 46168116.

It is not an unprimeable number, because it can be changed into a prime (611861647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27354 + ... + 44406.

It is an arithmetic number, because the mean of its divisors is an integer number (16116030).

Almost surely, 2^611861640 is an apocalyptic number.

611861640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611861640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031425920).

611861640 is an abundant number, since it is smaller than the sum of its proper divisors (1450990200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611861640 is a wasteful number, since it uses less digits than its factorization.

611861640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17103 (or 17099 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 611861640 is about 24735.8371598780. The cubic root of 611861640 is about 848.9544884670.

It can be divided in two parts, 61186 and 1640, that added together give a palindrome (62826).

The spelling of 611861640 in words is "six hundred eleven million, eight hundred sixty-one thousand, six hundred forty".